******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Hello, I am trying to set-up a "HistoryPoints" filter in the AcousticSolver which is solving Linearized Euler Equations. Unfotunately, this filter is never activated. The system is set-up to solve for 100 time steps and I wish to record values at points as well as lines. To start with, I played around with the points filter setup and this the format which I have used: <FILTERS> <FILTER TYPE="HistoryPoints"> <PARAM NAME="OutputFrequency">1</PARAM> <PARAM NAME="Points"> -100 0 0 </PARAM> </FILTER> <FILTER TYPE="Checkpoint"> <PARAM NAME="OutputFile">IntermediateFields</PARAM> <PARAM NAME="OutputFrequency">1</PARAM> </FILTER> </FILTERS> For some reason, the .his files are never written but .chk files are. What could I be doing wrong in my setup ? Regards, Ishan